The World Resources Institute has assembled a comprehensive web map that tracks deforestation and aforestation since 2000. Adjust the interval to see trends over time.
One thing I like is that it isn’t limited to the tropics. Discussions about deforestation often focus on that region of the world, as though it houses the only remaining “pristine” ecosystems. Global Forest Watch also trains the spotlight on temperate—and developed—countries, which play a significant but often overlooked role.